CN201156335Y - Teaching demonstration apparatus for resistance measurement by volt-ampere method - Google Patents
Teaching demonstration apparatus for resistance measurement by volt-ampere method Download PDFInfo
- Publication number
- CN201156335Y CN201156335Y CNU2008203001078U CN200820300107U CN201156335Y CN 201156335 Y CN201156335 Y CN 201156335Y CN U2008203001078 U CNU2008203001078 U CN U2008203001078U CN 200820300107 U CN200820300107 U CN 200820300107U CN 201156335 Y CN201156335 Y CN 201156335Y
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- resistance
- voltammetry
- resistance measurement
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Abstract
The utility model relates to a teaching electrics experiment, in particular to a refitting of an ammeter and a voltmeter used in resistance measurement with voltammetry in electrics experiments. The utility model discloses a resistance measurement with voltammetry teaching demonstration device used in middle school electrics experiments which can significantly analyze the differences between the inner and the outer connecting methods. The utility model has the technical proposal that the resistance measurement with voltammetry teaching demonstration device comprises a voltage measuring device and a current measuring instrument. The utility model is characterized in that the voltage measuring device is formed by parallel connection of a voltmeter and a resistance. The current measuring instrument is formed by series connection of an ammeter and a resistance. The utility model is used in middle school physics experiment demonstration. The significant differences between the inner and the outer connecting methods in resistance measurement with voltammetry can be obtained by reading the scales of the voltmeter and the ammeter in the circuits of the inner and the outer connecting methods. The refitting has simple structure and low cost, and is easy to be used.
Description
Technical field
The utility model relates to the teaching Experiments of Electricity, in particularly a kind of Experiments of Electricity, and the reometer that uses in the resistance measurement with voltammetry and the repacking of voltage table.
Background technology
In the Experiments of Electricity in middle school, the common voltage table is surveyed voltage, and reometer is surveyed electric current.Usually the internal resistance of voltage table is very big, and the internal resistance of reometer is very little.But in the experiment of resistance measurement with voltammetry, the voltage table in being connected in connection and the method for externally circuit, reometer to read value difference different not obvious, the student can not draw the interior connection of resistance measurement with voltammetry and the significant difference of method for externally preferably by experiment.
The utility model content
Technical problem to be solved in the utility model is, provides a kind of in the Experiments of Electricity of middle school, can obviously compare the resistance measurement with voltammetry teaching demonstration device of the interior connection and the method for externally difference of resistance measurement with voltammetry.
The technical scheme that the utility model solve the technical problem employing is, the resistance measurement with voltammetry teaching demonstration device comprises voltage measuring apparatus, current measuring device, it is characterized in that, described voltage measuring apparatus is made of voltage table and resistance parallel connection; Described current measuring device is made of reometer and resistance series connection;
Further, described voltage table is a needle dc voltmeter; Described reometer is pointer reometer.
The beneficial effects of the utility model are, interior connection by reading resistance measurement with voltammetry and the voltage table in the method for externally circuit, the scale value of reometer draw the interior connection of resistance measurement with voltammetry and the significant difference of method for externally, and simple in structure, with low cost, easy to be easy-to-use.
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail.
Description of drawings
Fig. 1 is the circuit diagram of embodiment.
In the accompanying drawing: 1---current measuring device.2---voltage measuring apparatus
Embodiment
Resistance measurement with voltammetry teaching demonstration device of the present utility model is to reequip accordingly on the basis of the needle dc voltmeter that uses in existing education experiment, pointer reometer, and then be connected in the interior connection circuit and method for externally circuit of resistance measurement with voltammetry, referring to Fig. 1, constitute current measuring device 1 by pointer reometer and resistance R 1 series connection, constitute voltage measuring apparatus 2 by needle dc voltmeter and resistance R 2 parallel connections.The current measuring device 1 that adopts pointer reometer, needle dc voltmeter to repack into, voltage measuring apparatus 2 is convenient to the adjustment of range, and simple in structure.The loop that is made of power supply, switch, bulb, slide rheostat R3, current measuring device 1, voltage measuring apparatus 2 is the circuit diagram of method for externally, and referring to the A of Fig. 1, current measuring device 1 is measured current in loop I
A, voltage measuring apparatus 2 is measured the voltage U of bulb side
A, by R=U/I, the lamp resistance that can obtain recording is R
The outer survey=U
A/ I
AThe loop that is made of power supply, switch, bulb, slide rheostat R3, current measuring device 1, voltage measuring apparatus 2 is the circuit diagram of interior connection, and referring to the B of Fig. 1, current measuring device 1 is measured current in loop I
B, the voltage U at two ends behind the voltage measuring apparatus 2 measurement reometer devices 1 series connection bulb
B, by R=U/I, the lamp resistance that can obtain recording is R
In Survey=U
B/ I
BBecause, the internal resistance of current measuring device 1 is bigger than the internal resistance of the normal pointer reometer that uses, the internal resistance of voltage measuring apparatus 2 is littler than the internal resistance of the normal needle dc voltmeter that uses, thereby is easy to just to find out the notable difference of the resistance of the interior connection of resistance measurement with voltammetry and the lamp resistance that method for externally is measured.If the actual resistance of bulb is R
Lamp, the internal resistance of pointer reometer is R
A, the internal resistance of needle dc voltmeter is R
v, then can calculate R
The outer surveyTheoretical value be { ((R
v* R2)/(R
v+ R2)) * R
Lamp}/{ ((R
v* R2)/(R
v+ R2))+R
Lamp, i.e. the lamp resistance value of calculating by meter is than the lamp resistance R of reality
LampLittle.As establish R
LampBe 1000 Ω, R
vBe 2000 Ω, R2 is 1000 Ω, then by R
The outer survey={ ((R
v* R2)/(R
v+ R2)) * R
Lamp}/{ ((R
v* R2)/(R
v+ R2))+R
LampCan get R
The outer survey=400 Ω.In like manner can calculate R
The interior surveyTheoretical value be ((R
A+ R1)+R
Lamp), i.e. the lamp resistance value of calculating by meter is than the lamp resistance R of reality
LampWant big.As establish R
LampBe 1000 Ω, R
ABe 0.12 Ω, R2 is 100 Ω, then by R
The interior survey={ ((R
A+ R1)+R
Lamp) can get R
The outer survey=1100.12 Ω.In teaching and experimental demonstration, directly compare the interior connection of resistance measurement with voltammetry and the significant difference of method for externally
Claims (2)
1. the resistance measurement with voltammetry teaching demonstration device comprises voltage measuring apparatus, current measuring device, it is characterized in that, described voltage measuring apparatus is made of voltage table and resistance parallel connection; Described current measuring device is made of reometer and resistance series connection.
2. resistance measurement with voltammetry teaching demonstration device as claimed in claim 1 is characterized in that, described voltage table is a needle dc voltmeter; Described reometer is pointer reometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203001078U CN201156335Y (en) | 2008-01-18 | 2008-01-18 | Teaching demonstration apparatus for resistance measurement by volt-ampere method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203001078U CN201156335Y (en) | 2008-01-18 | 2008-01-18 | Teaching demonstration apparatus for resistance measurement by volt-ampere method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201156335Y true CN201156335Y (en) | 2008-11-26 |
Family
ID=40104113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008203001078U Expired - Fee Related CN201156335Y (en) | 2008-01-18 | 2008-01-18 | Teaching demonstration apparatus for resistance measurement by volt-ampere method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201156335Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103680271A (en) * | 2013-12-12 | 2014-03-26 | 深圳供电局有限公司 | Emulational direct-current resistance tester |
| CN103680268A (en) * | 2013-12-04 | 2014-03-26 | 安徽农业大学 | Research experimental box of volt-ampere characteristics of linear resistance and nonlinear resistance |
| CN104464467A (en) * | 2014-12-26 | 2015-03-25 | 融水苗族自治县教育局 | Physical conductivity demonstrator |
| CN106093521A (en) * | 2016-06-17 | 2016-11-09 | 广州极飞电子科技有限公司 | Electric current detecting method, device and battery management system |
-
2008
- 2008-01-18 CN CNU2008203001078U patent/CN201156335Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103680268A (en) * | 2013-12-04 | 2014-03-26 | 安徽农业大学 | Research experimental box of volt-ampere characteristics of linear resistance and nonlinear resistance |
| CN103680271A (en) * | 2013-12-12 | 2014-03-26 | 深圳供电局有限公司 | Emulational direct-current resistance tester |
| CN103680271B (en) * | 2013-12-12 | 2016-02-03 | 深圳供电局有限公司 | A kind of Emulational direct-current resistance tester |
| CN104464467A (en) * | 2014-12-26 | 2015-03-25 | 融水苗族自治县教育局 | Physical conductivity demonstrator |
| CN106093521A (en) * | 2016-06-17 | 2016-11-09 | 广州极飞电子科技有限公司 | Electric current detecting method, device and battery management system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081126 Termination date: 20100220 |